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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f04bc1087ab866362de920d5f355de7f17d2c2c84b43e0dc2bcd80e8d10bb7' 
  AND token = 'SwRWFbMUF2S7ro42f+1uwjhDM2G08XvkXAXRuPM1Qhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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