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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c3145a0d8b92c2d423d8a462ae816dae5b81fea5b124f442f01ef2ea8cf50a' 
  AND token = 'ijArdw+85bxiTNgl9rrUvQOomw8zAcZBJl9OpKRIKhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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