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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73790c9a5da9eb9d6e3e380daf413ebb614a1f9d0cc02be485ae820d75b7c7ec' 
  AND token = 'lC49ygcDLtguIeIolrWIfEmMYgyTEnFCodkLygm6N34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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