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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e8ba0160d0f88f1d7e32384550b579d866241175fba64202d91f34bd48436a' 
  AND token = 'MtKZfoQaTZI0sCL/TnyhCcsK5A2CnN8MONMb8jhGzMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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