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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757ea07b5c726394350c4e626e12e6056b84f5cb4eb55446948759b4f6a0ceb7' 
  AND token = '6e4KKVNqj9yzebkMU7ySTU7gnGiSdj4l+wbZF00BZrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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