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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67606a46acf6883b3b9eae2ead48f8be754deb49317266804c864da8ce2f93a' 
  AND token = 'L6QRPXAr++Xc24+BZ1crEzujfPn48tRkAZqjfaRdcwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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