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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7798a131528d9f707eb7965b5a1d8322c1a30f4e9b8e3bf324c8427fe7fb99' 
  AND token = 'gYZZYWjDa0JWp0gWy7xu/VfiPepYeQTvYzR4zokMJSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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