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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e0be748d1e66383d177fad9d2df2a2d0f6e76fb9124a523cfce4c691db3a6b' 
  AND token = 'DaVvrgk0ks+mh+299qHGmj7mcm0TGHZ2iieUm2Fiww0=' 
  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"
    }
  }
}