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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834176e187be06967679078ffb34314e65c41c6b4608e8ceef4931f7161d96d8' 
  AND token = 'ShyD67YW+UV1fTrDsVr8Sl85ANJPFX/yjD6dvUi77sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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