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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca142efd89fd1ae3fcbb83c23013feb12db8f7e64cf1fa0108c1a936724ac456' 
  AND token = 'tflOnEM3tvvi9ZuZxeSkM72zqJ7oDmMEECyoqNjeBso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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