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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385deb78d6f1085872cd8842ff438380f58c74f46d9c0316c2a1d2d36e984c66' 
  AND token = '9T6bfXhde5XijXRATwZlSsm2CTVM1z6CbGUnsmz0K40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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