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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55519e2c1acbb6fbe17a8db76236d24e2177967c12c0d94cf99a9ea710b89f28' 
  AND token = 'x4YhEarL9YyadSIZn9AZoGXAJYpidXAKqZ2HWnfged0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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