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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40d2b386cb85312cabd00491d9f9df2cb9ce317038dd166995b5c315b08c94e' 
  AND token = 'xV1Wsh/tchZ3uax3e11KofiUTvCMQLgGzcyv/0tLILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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