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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e52a3369be75a1baf889f3a8dded435f6a5ab307c195449ad579ef0bf7040a5' 
  AND token = 'iln1ueoE/06wXUio6S44/yYsuAv9WUltojxLXp0Cssk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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