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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0557ddd3f1cce5eb24b23c2b79260e6f9633871a06b8e7c39fb3433554acd8da' 
  AND token = 'KHMXDL56o989K3DUCTVvUBXcaUyj7H3wT+YtG6feZBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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