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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e3737a1894cb8c9f7d6ee9ee0cff3f8332ea2555acd2f5349073ec66dae44e' 
  AND token = 'h0gjJ7kbrDB/V8DNY8frjgPXRqgx1TWrgQQ2W9tht74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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