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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8e6b925f19ad3ac6412d24f529772fd866c6542df43f77ae9f1e612e493670' 
  AND token = '/RK/QbrLvEp3o1MEO0vEiMFIkDPwjYPu9La186g1ikE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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