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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b04f3c24f89afb773f7ff444c7a224daf63498842b15d69ba59eaff3e2f3881' 
  AND token = 'ueU3GYQVE4eqYpBPmuPEN6CiN7R6Y6p9EgmgcbmLlAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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