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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d29cc9fa4203b2fedae4867b2c2f0071bb5f1f9e427b4faad3602e6401d7f54' 
  AND token = '2yCrLOw69pHjf/jpGNWOR982dxtDhIwFiH+ZRGcWb4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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