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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490508cc19c7c88fd79efdfe8a61e7df2e7a0071308fd3cb7e0799cbd6927235' 
  AND token = 'eaicMsVYEayMyq0TeFVnGVF/K4Kc1nvdtsEU8g7vuLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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