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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12db84c25c58580a06fc221056aaff9b15b6e4f45bab954528b99564bdac329a' 
  AND token = 'gmUtVW8Vz336Pn8Wqhnn+V0uyRo7tsYip99+84Snifc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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