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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7282911c8e7f5472fea51776b338fb0e359295f3d2e2ca997410191edbe54d8a' 
  AND token = 'YsBEgCqCf0CADkM1SADk7nTTb9Hrc9qNYMwn//MDb2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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