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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99c82d545e6c03553e52ced8abc0917bc800887c7564e2946ef82d15ac7f237' 
  AND token = 'cf34nBl3Nj8qbbfVZBl1xTPq9vVZU2+CtnioZm+j7U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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