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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c23a4aab1eb1b765230ff11487a9777db6f767a82b147b907cf2885339733f' 
  AND token = 'N7lCkn0vwc3WYmJmLblaDODAaQfD1f+F29FnrMq6zes=' 
  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"
    }
  }
}