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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ea6b50cd8e01b69f60a08bc79c0b8888c11f862c8a9982d93e766ad52e0526' 
  AND token = 'Fmar2lrQmNINuXQbR9rnseBDgpOZdMNZvVzkUObYd/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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