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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b346bf15a825ed3d81d8cae015b9113ce4701b17f86804bc0f19e7b2e99ce2' 
  AND token = 'fFweTAj9pc1BErEz/5XbuZ5bHF1tGJCiDtVGE8h4OVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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