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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b8147fc8c24d20f74e71ee62463aad65a96867ac1469a4ff82970625d68f3d' 
  AND token = 's2yqet26WBnHV33yhE2M0wB7D65mYaWgNc6t7t6DQKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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