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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e71b6dc7d11afb965641947fe121dc7fe06b7ff3e6f25b6303278cc59f8d2f' 
  AND token = 'rrUzCgdCRMh7j0PNW5mo0VqMXrV1CO7qhX/WIoJnsAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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