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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b2ab9fb3af3612e3e45f509ccf45023975177c3af2cc83ea7f7655b0915a73' 
  AND token = 'iLJcZYcBfCB9W+EKlq6+S2rBdvBblH1i+X7/4k9yzD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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