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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7bd36b9296dc524400af7bbe0d6909bb00c85dd8b862f4d19bcd116b9d285b' 
  AND token = '9O8/GEwWXU1fAOY7+ZWIsgIShOV+9bxepGPIVNyuAZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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