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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecec55d64030c1e9081a6a2d8d74ab9a2a07c3a81be4730a8047409ae7859fe3' 
  AND token = 'Chs7jiCLryZL+O5D0BKDoa4o9Vfv0lB5xXUOxHBr5so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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