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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ee04d70d59543a1ca74bac3a9fd3a78450face8564f9eafeee54427025e04a' 
  AND token = 'WcBORq8uSePOGHqV1MGlTH/hejN9xNJsUl+hD8FQ7yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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