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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6605f08664c487211083aa36d052375bc69c3c7dfba230c8f192d4078398f7b2' 
  AND token = '16hsmXWEt0OK5foZ23HBF+CLW3MSP8k9lRQLZK7v8YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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