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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90a6b156b27174e97a9cb8c1a13310fef8c6ffe7cb02dd0b26cac0fed1ee0bf' 
  AND token = 'FSLYm4Aua2uyRlLcNiAber1Um8Gjp4ts5v/N+gzBJdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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