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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768608a4d5a3928fce7e9e781ecea08bce6d4945549d02c5c3725bc646e17905' 
  AND token = 'VQ5LbCJJWVcM//VbMhAnvakkRXwzE6PtwP4TqpReCTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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