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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d684e0c32e337f12b813a74fd953810e762b57bc5a6f7902503cc16e741ceb' 
  AND token = 'OQzEFVucjU+zsVWc0EWpWzaM+74SavN1FuyLk/5L9/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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