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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0068103df6718abed97981a1e3f51256a262c0776be58013ff11be6c5084910' 
  AND token = 'A8pOt/b6bi7L8RFCvc8AiHY9bLsYd4kTvQTuMTfyf9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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