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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0361803c3dc2828b4c210a4eb75b731e116ac5134b174d3fa9786cbd2079ef25' 
  AND token = 'vTA9rUV5MF5YJfAYeoND94e77AH9eF3M5a57GQItZ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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