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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47aacac7a9c705c5eb89622d7e061ac0dc7cf99de4f61d9b7ab8d11bdb17a75c' 
  AND token = 'AAJ0HzBD2NdJyAT/4p0R67q5FVJwyqcdamAEggZ9ZQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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