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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a7b433253ced49f8f1eacf62f9f0c253085e6d1f2ff91543943b374fca9aab' 
  AND token = '1DrCEgezByX6vVaGtp33pdCAC9BZjF/3VMaQZ71ewmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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