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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e387ecee479d93933d8bebfaa132d94e342011d7a8a5933b008713b4d684757' 
  AND token = '18uqueWDnHQ03tRfPwLQubkGg6D6Yh3K6tr1ppeVBok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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