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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366d0dc97d6b98e7f820554d06d6ecbb3de54aa34c25ca0b22cfe3b2b3b9648e' 
  AND token = 'SUnjU219WyW4lfFRomwCfJ/P83BDM03djw42as9sv/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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