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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581a631e9adeae7c3397b2fea69ff634302af65d1fe14ad8b3bf31d7110b5ea6' 
  AND token = 'CNqg9o6vXwQkl01bdgV77Xyj6iRpyT9tX9SurgfSXes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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