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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306b771ceb7f5c93f3e647c440e31da810ce9f50a12ebadf4798b68e9219309d' 
  AND token = 'NsM9ZIYA88I7n/XX5iPvrqUTnxOl+Fk+9PolhAXrxPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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