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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113cbcb527b5892f539d3b05b899b15df163eb33c94bac8e8eaffafd5dda7dc0' 
  AND token = '37Cy13OkixN66XgBqrbJ8FZ1GWQxwf0DEVuo2ROIOmE=' 
  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"
    }
  }
}