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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c34b4b1cc7f034ac803257979da112ee89e2a29cf944cf35f534e95352c078b' 
  AND token = '0HsaN95vnKbfHan5uAhDb/ps2WZRr7vt+Ha3nYw7qHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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