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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161329ace156f27ccd2e792f8528431a9d95f64be857c92b4ed0438238f20e7f' 
  AND token = '8x69ooAEQlHhtSNA/RIkMdR4rZLCEQk9cyl7iStdu5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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