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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2066a9c8d643f264ad03b586b8619fba40b1437b14334bd399bb36a2fb527440' 
  AND token = '29Ray9H80LjFWbu14+608yDd+jqZm3om33x9v3PE11s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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