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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8984ca8aa72f93041e68df97c05c6c5f1ea2db5ac6b3610f1f934ec2ca7a109' 
  AND token = '78nL2oaIqlrtcIDUWlRou2a7TkMSbKm9z4ZstTvKhLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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