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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ac725a072bc1d4112948a68d66bae2f88bd4ec94e8d453eb299b5163f0a145' 
  AND token = 'HVH8A8RkQ9UyJ4rqEm9OZ6yfmzmzknkGsOAagCWy4JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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