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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411028df792f70983931b93fd8247708e7538761bbb06b0883e8bd45827fcd2d' 
  AND token = 'Kfy3Mbg8fpYf4fc9CkA8AZ7uS7gyO03GSmXZReK3giU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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