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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956ac0bfc20902c05f70f4e0d2127a299368d7141fbae3f72074bc2fba7067f6' 
  AND token = 'FSAgcMoEWiHREfJKstABwaC3iGYoJTPrTmCLeWbd0W0=' 
  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"
    }
  }
}