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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc39af6cb9fbf4eac37e4fdf9bba9065e7abcfeb15633951c13f447d306de30' 
  AND token = '4uw+87A744vDXfCg+/LCO9k+juv8+lIFLIYCNXUfQnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}