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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3512f63f78cad039cac49a73d36ca2b546f2a7aefd29680a4698e5ef964cd3' 
  AND token = 'VuZPgWnZN0WGQ6/2G7JYTyUP8UMkGRK81gH6DVZr7rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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