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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aad1918810b585d1e2a438a33b42da6087e0c22f0c7dca2aab78ffe34c36d81' 
  AND token = 'huN4GQO4nKbsUu/MKoM1XDoAWUi8is2XiXenaYtS3Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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