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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3773ac22aa0505f293a273edb60c7c8bb879d38f719b6b3e4f772f516a590dbc' 
  AND token = '6wW7lbsY37QzvPNyNQE3WzUlVuHYW6WyK6VD26O5pS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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