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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d214d8b34f990609527fdf1e0f5e50c24a640609af6bd1e03bc8a3f27e6d629' 
  AND token = 'WtBhCWfpk+ipW9P7sOwIPjr3TQS40ybMsMsgNpPMHnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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