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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c606c9609d09dc4b8332061f7dde17076ea2d652713dbe01fc8e38a4e3522cc' 
  AND token = 'KNN8ERmWQnAdcIWJArwjxgaJlMh3LHAVWByn0wS7pr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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