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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ad2b5af7063c8df905c4249b5b82a9c38e84414b42a9ce0e18619d3a9982ea' 
  AND token = 'JsL64/63hJS+L+uUTABoLkQvUcoL5PqppOYf02gzM90=' 
  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"
    }
  }
}